Square D | 999316 | Circuit Breaker | 100A | Bolt-On

The Square D 999316 Circuit Breaker is a precise, 100-amp bolt-on protector designed for reliability in maintenance, retrofit, and replacement projects. When your system requires an exact match to Square D’s bolt-on style and 100A rating, this part delivers the trusted protection you rely on, with a robust mounting mechanism built for secure performance in demanding panels.

Key details

• Amperage: 100 A
• Mounting: Bolt-On
• Part number: 999316
• Compatibility note: Intended for Square D bolt-on panel installations that require a 100A breaker; always verify fit with your specific panel model and rating.

Why this breaker matters

This 999316 breaker provides a precise protection profile for circuits demanding 100 amps, ensuring consistent trip behavior and dependable shutoff during fault conditions. Its bolt-on design facilitates a secure, rigid connection to the panel’s bus assembly, reducing the risk of loose contacts and arcing. By matching the exact part number, you minimize compatibility surprises and downtime, especially in retrofit and replacement scenarios where exact specifications are non-negotiable.

Ideal use scenarios

• Retrofits where a 100A bolt-on breaker is required to restore or upgrade circuit protection in Square D panels
• Maintenance replace-and-upgrade projects that demand exact compatibility to avoid panel modification
• Repairs for aging systems where a reliable, factory-listed 100A bolt-on solution is needed
• Engineering-friendly replacements that simplify ordering by referencing the precise part number

Practical guidance for ordering and installation

• Before ordering, confirm that your panel requires a 100A bolt-on breaker and that the 999316 part number aligns with your panel’s model and rating.
• Plan for a de-energized installation: disconnect power, follow panel safety procedures, and reassemble only after verifying all connections are clean and secure.
• Install the breaker per manufacturer guidelines for bolt-on devices, ensuring the mounting bolt engages firmly with the panel’s bus connection.
• After installation, double-check that the breaker operates smoothly through its trip mechanism and that the panel cover seats correctly without interference.

For reliable protection that aligns with your Square D system’s design, the 999316 100A bolt-on circuit breaker is purpose-built for maintenance, retrofit, and replacement projects where exact specs and secure, durable performance matter most.